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of Washington state), a low-viscosity lava origin (similar to the pahoehoe flows of Hawaii), a glacial origin, or some combination of the aforementioned mechanisms. The presence of pitted mounds on the valley floor has also been subject to debate and underpins the different hypotheses that have been proposed, and have variably been suggested to be pingoes and rootless cones. Polygonal terrains of varying scales observed in the Athabasca Valles

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